Barney finally meets his father on "Legendaddy." And he's played by the great John Lithgow.
It's Valentine's Day on How I Met Your Mother. See what this means for the characters in the official promo for "Desperation Day."
Katy Perry will guest star on the How I Met Your Mother episode "Oh Honey." Will she be THE mother?!? No. But she says she will be in one of these great promos.

How I Met Your Mother Season 6 Quotes

Robin: Ted, the future is scary. But you can't just run back to the past because it's familiar. Yes, it's tempting...
Barney: But it's a mistake.

Sometimes things have to fall apart to make way for better things...we're done here.